Ewan Law (1747 – 24 April 1829) was a British politician, MP for Westbury (1795–1800) and Newtown (1802). He was baptised on 30 October 1747, the son of Edmund Law, later Bishop of Carlisle and Mary Chistian. Elected MP for Westbury in 1790, Law spoke against the Impeachment of Warren Hastings (his brother Edward Law was senior counsel for Hastings' defence), believing Hastings to be "honest and honourable" and condemning the conduct of the trial as "a libel on British justice" on 6 June 1793. He vacated the seat in January 1795. He died on 24 April 1829.